A coding optimized polarization conversion metasurface in broadband and wide-angle

In this article, a coding optimized metasurface is proposed for linear polarization conversion in broadband and wide-angle. Using an improved coding method, the geometry of the metallic structure and the size of the unit cell are encoded with a code sequence. The code sequence is optimized by genetic algorithm, considering bandwidth, efficiency, and angular stability. In this way, a coding optimized metasurface was obtained for polarization conversion in broadband and wide-angle. It can convert linear polarized incidence to its orthogonal polarized reflection in 8 to 18.9 GHz and 0 degrees to 45 degrees, with the polarization conversion ratio larger than 80%. Both simulated and measured results demonstrated the effectiveness of the proposed metasurface. Hence, our method offers an effective strategy to design high-performance polarization conversion metasurfaces.